* {
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
}

li {
    list-style: none;
}

html,
body,
#box {
    width: 100%;
    height: 100%;
}

#box {
    background-color: #eee;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.footer {
    width: 100%;
    height: 40px;
    background-color: skyblue;
    display: flex;
    justify-content: space-around;
    line-height: 40px;
}

.content {
    width: 100%;
    flex: 1;
    background-color: orange;
}
